Image forming apparatus
a technology of image forming apparatus and forming apparatus, which is applied in the direction of electrographic process apparatus, printing, instruments, etc., can solve the problems of deteriorating degree of parallelization, processing unit slightly deformation, and further deteriorating accuracy of parallelization
Inactive Publication Date: 2011-11-22
KONICA MINOLTA BUSINESS TECH INC
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Benefits of technology
This solution stabilizes the parallelization between the photoconductive drum and the LED print head over time, facilitating easy maintenance and ensuring high-quality, sharp, and reproducible color images without color skew, even during LED print head replacement.
Problems solved by technology
In color image forming apparatus, the process unit of each color is configured with a photoconductive drum and members arranged at its peripheral such as a charging device, exposing device, developing device and cleaning device, and a degree of parallelization between each member and the photoconductive drum is key issue to improve sharpness of an image and stability of reproducibility.
However, even by the above adjusting method, there is a case where the process unit is slightly deformed when the photoconductive drum and its drive mechanism, a developing roller, and a screw and its drive mechanism are assembled and connected.
Thus the position LED print head is misaligned and the degree of parallelization is deteriorated.
Further when the process unit is deformed with time, the accuracy of parallelization is further deteriorated.
Also, it was inconvenient that when the LED print head is replaced, the apparatus had to be carried into a maintenance room to carry out adjusting work, thus field service was extremely difficult.
However, since the position setting section and the photoconductive drum abut each other in sliding manner, it is not preferable as a positioning means and the degree of parallelization cannot be maintained stably.Patent Document 1: Tokkai 2005-55781Patent Document 2: Tokkai 2005-242119
Method used
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[0030]The following will describe the image forming apparatus related to the present invention with reference to the drawings.
[0031]FIG. 1 is schematic front view of an image forming apparatus related to the present invention. However, the image forming apparatus of the present invention is not limited to the embodiments below.
[0032]The present image forming apparatus is configured with an image forming apparatus main body GH and an image scanning apparatus YS.
[0033]The image forming apparatus main body GH is a so-called “a tandem type color image forming apparatus” configured with a plurality of sets of image forming sections 10Y, 10M, 10C and 10K, an intermediate transfer substance 6 in a shape of belt, a transfer section 7A, a sheet feeding section 20 and fixing device 9.
[0034]Above the image forming apparatus main body GH, the image scanning apparatus YS configured with an automatic document feeding device 501 and a scanning device 502 are disposed. A document d placed on a docu...
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An image forming apparatus having; a photoconductive drum, a LED print head to write an image on a surface of the photoconductive drum, and a positioning device to locate the LED print head in a relative position in respect to the photoconductive drum, includes; centering sections respectively arranged at both ends of a center shaft of the photoconductive drum so as to rotate centering around the shaft thereof, LED print head positioning members fixed at the centering member respectively, and a rotation direction determination member to fix the centering members onto an image forming apparatus main body side when a preferable relative position of the LED print head in respect to the photoconductive drum is obtained by rotating the centering sections.
Description
[0001]This application is based on Japanese Patent Application No. 2006-353746 filed on Dec. 28, 2006, in Japanese Patent Office, the entire content of which is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to an image forming apparatus capable of high accuracy positioning of a process unit representing image forming section equipped with a LED print head.[0003]In color image forming apparatus, the process unit of each color is configured with a photoconductive drum and members arranged at its peripheral such as a charging device, exposing device, developing device and cleaning device, and a degree of parallelization between each member and the photoconductive drum is key issue to improve sharpness of an image and stability of reproducibility. In color image forming particularly, adjustment of the position by individual process unit is needed first. Further the degree of parallelization between each process unit is important to preve...
Claims
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IPC IPC(8): B41J2/385
CPCG03G15/04054G03G15/326
InventorTANAKA, KENICHI
OwnerKONICA MINOLTA BUSINESS TECH INC